EP 0640747 B1 19970319 - Boiler system pH/phosphate program control method
Title (en)
Boiler system pH/phosphate program control method
Title (de)
System zur Regelung eines Kessels nach einem PH/phosphat-Programm
Title (fr)
Système de commande de chaudière par un programme ph/phosphate
Publication
Application
Priority
US 10952593 A 19930820
Abstract (en)
[origin: EP0640747A1] A pH/phosphate program in a boiler water system is controlled by: (1) determining the feed rate of the phosphate to the boiler by adding to a phosphate-feed stream containing the phosphate feeding to the boiler a phosphate-feed tracer in known proportion to the phosphate, determining the concentration of the phosphate-feed tracer in the phosphate-feed stream and correlating the phosphate-feed tracer concentration to the concentration of the phosphate; (2) determining the boiler cycles value by adding an inert blowdown tracer to the boiler water at a known rate and determining the concentration of the blowdown tracer in the blowdown; (3) determining the blowdown pH value; (4) providing the data defining at least the phosphate-feed rate value, the boiler cycles value, and the blowdown pH value to a control center; (5) optionally maintaining the alkalinity source feed rate constant or providing the data defining the alkalinity source feed rate to the control center; wherein the control center directs at least one responsive adjustment of the phosphate feed to the boiler, the alkalinity source feed to the boiler, and/or the blowdown rate when a sodium to phosphate mole ratio in the boiler water strays from the target mole ratio, wherein the responsive adjustment directed by the control center changes the sodium to phosphate mole ratio in the boiler water in the direction of regaining the target sodium to phosphate mole ratio in the boiler water.
IPC 1-7
IPC 8 full level
F22B 37/52 (2006.01); C02F 5/04 (2006.01); C23F 11/18 (2006.01); F22B 37/56 (2006.01); F22D 11/00 (2006.01); G01N 33/18 (2006.01); G05D 21/02 (2006.01)
CPC (source: EP)
C23F 11/184 (2013.01); F22B 37/565 (2013.01); F22D 11/006 (2013.01); G01N 33/18 (2013.01); G01N 33/1826 (2013.01); G05D 21/02 (2013.01); Y02A 20/20 (2017.12)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0640747 A1 19950301; EP 0640747 B1 19970319; BR 9403301 A 19950718; DE 69402138 D1 19970424; DE 69402138 T2 19971016; ES 2102748 T3 19970801; JP H07145909 A 19950606
DOCDB simple family (application)
EP 94113074 A 19940822; BR 9403301 A 19940822; DE 69402138 T 19940822; ES 94113074 T 19940822; JP 19708794 A 19940822